drivers/gpu/drm/exynos/exynos_drm_plane.c

   1 /*
   2  * Copyright (C) 2011 Samsung Electronics Co.Ltd
   3  * Authors: Joonyoung Shim <jy0922.shim@samsung.com>
   4  *
   5  * This program is free software; you can redistribute  it and/or modify it
   6  * under  the terms of  the GNU General  Public License as published by the
   7  * Free Software Foundation;  either version 2 of the  License, or (at your
   8  * option) any later version.
   9  *
  10  */
  11
  12 #include <drm/drmP.h>
  13
  14 #include <drm/drm_atomic.h>
  15 #include <drm/drm_atomic_helper.h>
  16 #include <drm/drm_plane_helper.h>
  17 #include <drm/exynos_drm.h>
  18 #include "exynos_drm_drv.h"
  19 #include "exynos_drm_crtc.h"
  20 #include "exynos_drm_fb.h"
  21 #include "exynos_drm_gem.h"
  22 #include "exynos_drm_plane.h"
  23
  24 /*
  25  * This function is to get X or Y size shown via screen. This needs length and
  26  * start position of CRTC.
  27  *
  28  *      <--- length --->
  29  * CRTC ----------------
  30  *      ^ start        ^ end
  31  *
  32  * There are six cases from a to f.
  33  *
  34  *             <----- SCREEN ----->
  35  *             0                 last
  36  *   ----------|------------------|----------
  37  * CRTCs
  38  * a -------
  39  *        b -------
  40  *        c --------------------------
  41  *                 d --------
  42  *                           e -------
  43  *                                  f -------
  44  */
  45 static int exynos_plane_get_size(int start, unsigned length, unsigned last)
  46 {
  47         int end = start + length;
  48         int size = 0;
  49
  50         if (start <= 0) {
  51                 if (end > 0)
  52                         size = min_t(unsigned, end, last);
  53         } else if (start <= last) {
  54                 size = min_t(unsigned, last - start, length);
  55         }
  56
  57         return size;
  58 }
  59
  60 static void exynos_plane_mode_set(struct exynos_drm_plane_state *exynos_state)
  61 {
  62         struct drm_plane_state *state = &exynos_state->base;
  63         struct drm_crtc *crtc = state->crtc;
  64         struct drm_crtc_state *crtc_state =
  65                         drm_atomic_get_existing_crtc_state(state->state, crtc);
  66         struct drm_display_mode *mode = &crtc_state->adjusted_mode;
  67         int crtc_x, crtc_y;
  68         unsigned int crtc_w, crtc_h;
  69         unsigned int src_x, src_y;
  70         unsigned int src_w, src_h;
  71         unsigned int actual_w;
  72         unsigned int actual_h;
  73
  74         /*
  75          * The original src/dest coordinates are stored in exynos_state->base,
  76          * but we want to keep another copy internal to our driver that we can
  77          * clip/modify ourselves.
  78          */
  79
  80         crtc_x = state->crtc_x;
  81         crtc_y = state->crtc_y;
  82         crtc_w = state->crtc_w;
  83         crtc_h = state->crtc_h;
  84
  85         src_x = state->src_x >> 16;
  86         src_y = state->src_y >> 16;
  87         src_w = state->src_w >> 16;
  88         src_h = state->src_h >> 16;
  89
  90         /* set ratio */
  91         exynos_state->h_ratio = (src_w << 16) / crtc_w;
  92         exynos_state->v_ratio = (src_h << 16) / crtc_h;
  93
  94         /* clip to visible area */
  95         actual_w = exynos_plane_get_size(crtc_x, crtc_w, mode->hdisplay);
  96         actual_h = exynos_plane_get_size(crtc_y, crtc_h, mode->vdisplay);
  97
  98         if (crtc_x < 0) {
  99                 if (actual_w)
 100                         src_x += ((-crtc_x) * exynos_state->h_ratio) >> 16;
 101                 crtc_x = 0;
 102         }
 103
 104         if (crtc_y < 0) {
 105                 if (actual_h)
 106                         src_y += ((-crtc_y) * exynos_state->v_ratio) >> 16;
 107                 crtc_y = 0;
 108         }
 109
 110         /* set drm framebuffer data. */
 111         exynos_state->src.x = src_x;
 112         exynos_state->src.y = src_y;
 113         exynos_state->src.w = (actual_w * exynos_state->h_ratio) >> 16;
 114         exynos_state->src.h = (actual_h * exynos_state->v_ratio) >> 16;
 115
 116         /* set plane range to be displayed. */
 117         exynos_state->crtc.x = crtc_x;
 118         exynos_state->crtc.y = crtc_y;
 119         exynos_state->crtc.w = actual_w;
 120         exynos_state->crtc.h = actual_h;
 121
 122         DRM_DEBUG_KMS("plane : offset_x/y(%d,%d), width/height(%d,%d)",
 123                         exynos_state->crtc.x, exynos_state->crtc.y,
 124                         exynos_state->crtc.w, exynos_state->crtc.h);
 125 }
 126
 127 static void exynos_drm_plane_reset(struct drm_plane *plane)
 128 {
 129         struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 130         struct exynos_drm_plane_state *exynos_state;
 131
 132         if (plane->state) {
 133                 exynos_state = to_exynos_plane_state(plane->state);
 134                 if (exynos_state->base.fb)
 135                         drm_framebuffer_unreference(exynos_state->base.fb);
 136                 kfree(exynos_state);
 137                 plane->state = NULL;
 138         }
 139
 140         exynos_state = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
 141         if (exynos_state) {
 142                 exynos_state->zpos = exynos_plane->config->zpos;
 143                 plane->state = &exynos_state->base;
 144                 plane->state->plane = plane;
 145         }
 146 }
 147
 148 static struct drm_plane_state *
 149 exynos_drm_plane_duplicate_state(struct drm_plane *plane)
 150 {
 151         struct exynos_drm_plane_state *exynos_state;
 152         struct exynos_drm_plane_state *copy;
 153
 154         exynos_state = to_exynos_plane_state(plane->state);
 155         copy = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
 156         if (!copy)
 157                 return NULL;
 158
 159         __drm_atomic_helper_plane_duplicate_state(plane, &copy->base);
 160         copy->zpos = exynos_state->zpos;
 161         return &copy->base;
 162 }
 163
 164 static void exynos_drm_plane_destroy_state(struct drm_plane *plane,
 165                                            struct drm_plane_state *old_state)
 166 {
 167         struct exynos_drm_plane_state *old_exynos_state =
 168                                         to_exynos_plane_state(old_state);
 169         __drm_atomic_helper_plane_destroy_state(old_state);
 170         kfree(old_exynos_state);
 171 }
 172
 173 static int exynos_drm_plane_atomic_set_property(struct drm_plane *plane,
 174                                                 struct drm_plane_state *state,
 175                                                 struct drm_property *property,
 176                                                 uint64_t val)
 177 {
 178         struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 179         struct exynos_drm_plane_state *exynos_state =
 180                                         to_exynos_plane_state(state);
 181         struct exynos_drm_private *dev_priv = plane->dev->dev_private;
 182         const struct exynos_drm_plane_config *config = exynos_plane->config;
 183
 184         if (property == dev_priv->plane_zpos_property &&
 185             (config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS))
 186                 exynos_state->zpos = val;
 187         else
 188                 return -EINVAL;
 189
 190         return 0;
 191 }
 192
 193 static int exynos_drm_plane_atomic_get_property(struct drm_plane *plane,
 194                                           const struct drm_plane_state *state,
 195                                           struct drm_property *property,
 196                                           uint64_t *val)
 197 {
 198         const struct exynos_drm_plane_state *exynos_state =
 199                 container_of(state, const struct exynos_drm_plane_state, base);
 200         struct exynos_drm_private *dev_priv = plane->dev->dev_private;
 201
 202         if (property == dev_priv->plane_zpos_property)
 203                 *val = exynos_state->zpos;
 204         else
 205                 return -EINVAL;
 206
 207         return 0;
 208 }
 209
 210 static struct drm_plane_funcs exynos_plane_funcs = {
 211         .update_plane   = drm_atomic_helper_update_plane,
 212         .disable_plane  = drm_atomic_helper_disable_plane,
 213         .destroy        = drm_plane_cleanup,
 214         .set_property   = drm_atomic_helper_plane_set_property,
 215         .reset          = exynos_drm_plane_reset,
 216         .atomic_duplicate_state = exynos_drm_plane_duplicate_state,
 217         .atomic_destroy_state = exynos_drm_plane_destroy_state,
 218         .atomic_set_property = exynos_drm_plane_atomic_set_property,
 219         .atomic_get_property = exynos_drm_plane_atomic_get_property,
 220 };
 221
 222 static int
 223 exynos_drm_plane_check_size(const struct exynos_drm_plane_config *config,
 224                             struct exynos_drm_plane_state *state)
 225 {
 226         bool width_ok = false, height_ok = false;
 227
 228         if (config->capabilities & EXYNOS_DRM_PLANE_CAP_SCALE)
 229                 return 0;
 230
 231         if (state->src.w == state->crtc.w)
 232                 width_ok = true;
 233
 234         if (state->src.h == state->crtc.h)
 235                 height_ok = true;
 236
 237         if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
 238             state->h_ratio == (1 << 15))
 239                 width_ok = true;
 240
 241         if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
 242             state->v_ratio == (1 << 15))
 243                 height_ok = true;
 244
 245         if (width_ok && height_ok)
 246                 return 0;
 247
 248         DRM_DEBUG_KMS("scaling mode is not supported");
 249         return -ENOTSUPP;
 250 }
 251
 252 static int exynos_plane_atomic_check(struct drm_plane *plane,
 253                                      struct drm_plane_state *state)
 254 {
 255         struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 256         struct exynos_drm_plane_state *exynos_state =
 257                                                 to_exynos_plane_state(state);
 258         int ret = 0;
 259
 260         if (!state->crtc || !state->fb)
 261                 return 0;
 262
 263         /* translate state into exynos_state */
 264         exynos_plane_mode_set(exynos_state);
 265
 266         ret = exynos_drm_plane_check_size(exynos_plane->config, exynos_state);
 267         return ret;
 268 }
 269
 270 static void exynos_plane_atomic_update(struct drm_plane *plane,
 271                                        struct drm_plane_state *old_state)
 272 {
 273         struct drm_plane_state *state = plane->state;
 274         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(state->crtc);
 275         struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 276
 277         if (!state->crtc)
 278                 return;
 279
 280         plane->crtc = state->crtc;
 281         exynos_plane->pending_fb = state->fb;
 282
 283         if (exynos_crtc->ops->update_plane)
 284                 exynos_crtc->ops->update_plane(exynos_crtc, exynos_plane);
 285 }
 286
 287 static void exynos_plane_atomic_disable(struct drm_plane *plane,
 288                                         struct drm_plane_state *old_state)
 289 {
 290         struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 291         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(old_state->crtc);
 292
 293         if (!old_state->crtc)
 294                 return;
 295
 296         if (exynos_crtc->ops->disable_plane)
 297                 exynos_crtc->ops->disable_plane(exynos_crtc, exynos_plane);
 298 }
 299
 300 static const struct drm_plane_helper_funcs plane_helper_funcs = {
 301         .atomic_check = exynos_plane_atomic_check,
 302         .atomic_update = exynos_plane_atomic_update,
 303         .atomic_disable = exynos_plane_atomic_disable,
 304 };
 305
 306 static void exynos_plane_attach_zpos_property(struct drm_plane *plane,
 307                                               unsigned int zpos)
 308 {
 309         struct drm_device *dev = plane->dev;
 310         struct exynos_drm_private *dev_priv = dev->dev_private;
 311         struct drm_property *prop;
 312
 313         prop = dev_priv->plane_zpos_property;
 314         if (!prop) {
 315                 prop = drm_property_create_range(dev, 0, "zpos",
 316                                                  0, MAX_PLANE - 1);
 317                 if (!prop)
 318                         return;
 319
 320                 dev_priv->plane_zpos_property = prop;
 321         }
 322
 323         drm_object_attach_property(&plane->base, prop, zpos);
 324 }
 325
 326 int exynos_plane_init(struct drm_device *dev,
 327                       struct exynos_drm_plane *exynos_plane,
 328                       unsigned int index, unsigned long possible_crtcs,
 329                       const struct exynos_drm_plane_config *config)
 330 {
 331         int err;
 332
 333         err = drm_universal_plane_init(dev, &exynos_plane->base,
 334                                        possible_crtcs,
 335                                        &exynos_plane_funcs,
 336                                        config->pixel_formats,
 337                                        config->num_pixel_formats,
 338                                        config->type, NULL);
 339         if (err) {
 340                 DRM_ERROR("failed to initialize plane\n");
 341                 return err;
 342         }
 343
 344         drm_plane_helper_add(&exynos_plane->base, &plane_helper_funcs);
 345
 346         exynos_plane->index = index;
 347         exynos_plane->config = config;
 348
 349         exynos_plane_attach_zpos_property(&exynos_plane->base, config->zpos);
 350
 351         return 0;
 352 }